2 * Copyright (c) 1990,1991 Regents of The University of Michigan.
5 * Permission to use, copy, modify, and distribute this software and
6 * its documentation for any purpose and without fee is hereby granted,
7 * provided that the above copyright notice appears in all copies and
8 * that both that copyright notice and this permission notice appear
9 * in supporting documentation, and that the name of The University
10 * of Michigan not be used in advertising or publicity pertaining to
11 * distribution of the software without specific, written prior
12 * permission. This software is supplied as is without expressed or
13 * implied warranties of any kind.
15 * Research Systems Unix Group
16 * The University of Michigan
18 * 535 W. William Street
21 * netatalk@itd.umich.edu
28 #include <sys/param.h>
29 #include <sys/systm.h>
32 #include <sys/socket.h>
33 #include <sys/socketvar.h>
36 #include <net/route.h>
40 #include <netatalk/at.h>
41 #include <netatalk/at_var.h>
42 #include <netatalk/ddp.h>
43 #include <netatalk/ddp_var.h>
44 #include <netatalk/at_extern.h>
49 ddp_output(struct mbuf *m, struct socket *so)
52 struct ddpcb *ddp = sotoddpcb(so);
56 mac_create_mbuf_from_socket(so, m);
60 M_PREPEND(m, sizeof(struct ddpehdr), M_DONTWAIT);
64 deh = mtod(m, struct ddpehdr *);
68 deh->deh_len = m->m_pkthdr.len;
70 deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
71 deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
72 deh->deh_dport = ddp->ddp_fsat.sat_port;
73 deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
74 deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
75 deh->deh_sport = ddp->ddp_lsat.sat_port;
78 * The checksum calculation is done after all of the other bytes have
82 deh->deh_sum = at_cksum(m, sizeof(int));
86 deh->deh_bytes = htonl(deh->deh_bytes);
89 printf ("ddp_output: from %d.%d:%d to %d.%d:%d\n",
90 ntohs(deh->deh_snet), deh->deh_snode, deh->deh_sport,
91 ntohs(deh->deh_dnet), deh->deh_dnode, deh->deh_dport);
93 return (ddp_route(m, &ddp->ddp_route));
97 at_cksum(struct mbuf *m, int skip)
102 for (; m; m = m->m_next) {
103 for (data = mtod(m, u_char *), end = data + m->m_len; data < end;
109 cksum = (cksum + *data) << 1;
110 if (cksum & 0x00010000) {
120 return ((u_short)cksum);
124 ddp_route(struct mbuf *m, struct route *ro)
126 struct sockaddr_at gate;
129 struct at_ifaddr *aa = NULL;
130 struct ifnet *ifp = NULL;
134 /* Check for net zero, node zero ("myself") */
135 if (satosat(&ro->ro_dst)->sat_addr.s_net == ATADDR_ANYNET
136 && satosat(&ro->ro_dst)->sat_addr.s_node == ATADDR_ANYNODE) {
137 /* Find the loopback interface */
142 * if we have a route, find the ifa that refers to this route.
143 * I.e The ifa used to get to the gateway.
145 if ((ro->ro_rt == NULL)
146 || (ro->ro_rt->rt_ifa == NULL)
147 || ((ifp = ro->ro_rt->rt_ifa->ifa_ifp) == NULL)) {
150 if ((ro->ro_rt != NULL)
151 && (ro->ro_rt->rt_ifa)
152 && (ifp = ro->ro_rt->rt_ifa->ifa_ifp)) {
153 net = ntohs(satosat(ro->ro_rt->rt_gateway)->sat_addr.s_net);
154 for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) {
155 if (((net == 0) || (aa->aa_ifp == ifp)) &&
156 net >= ntohs(aa->aa_firstnet) &&
157 net <= ntohs(aa->aa_lastnet)) {
163 #ifdef NETATALK_DEBUG
164 if (ro->ro_rt == NULL)
165 printf ("ddp_route: no ro_rt.\n");
166 else if (ro->ro_rt->rt_ifa == NULL)
167 printf ("ddp_route: no ro_rt->rt_ifa\n");
169 printf ("ddp_route: no ro_rt->rt_ifa->ifa_ifp\n");
171 return (ENETUNREACH);
175 #ifdef NETATALK_DEBUG
176 printf("ddp_route: no atalk address found for %s\n",
180 return (ENETUNREACH);
184 * if the destination address is on a directly attached node use that,
185 * else use the official gateway.
187 if (ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) >=
188 ntohs(aa->aa_firstnet) &&
189 ntohs(satosat(&ro->ro_dst)->sat_addr.s_net) <=
190 ntohs(aa->aa_lastnet)) {
191 gate = *satosat(&ro->ro_dst);
193 gate = *satosat(ro->ro_rt->rt_gateway);
197 * There are several places in the kernel where data is added to
198 * an mbuf without ensuring that the mbuf pointer is aligned.
199 * This is bad for transition routing, since phase 1 and phase 2
200 * packets end up poorly aligned due to the three byte elap header.
202 if (!(aa->aa_flags & AFA_PHASE2)) {
203 MGET(m0, M_DONTWAIT, MT_DATA);
206 printf("ddp_route: no buffers\n");
210 mac_copy_mbuf(m, m0);
213 /* XXX perhaps we ought to align the header? */
214 m0->m_len = SZ_ELAPHDR;
217 elh = mtod(m, struct elaphdr *);
218 elh->el_snode = satosat(&aa->aa_addr)->sat_addr.s_node;
219 elh->el_type = ELAP_DDPEXTEND;
220 elh->el_dnode = gate.sat_addr.s_node;
224 #ifdef NETATALK_DEBUG
225 printf ("ddp_route: from %d.%d to %d.%d, via %d.%d (%s)\n",
226 ntohs(satosat(&aa->aa_addr)->sat_addr.s_net),
227 satosat(&aa->aa_addr)->sat_addr.s_node,
228 ntohs(satosat(&ro->ro_dst)->sat_addr.s_net),
229 satosat(&ro->ro_dst)->sat_addr.s_node,
230 ntohs(gate.sat_addr.s_net),
231 gate.sat_addr.s_node,
235 /* short-circuit the output if we're sending this to ourself */
236 if ((satosat(&aa->aa_addr)->sat_addr.s_net == satosat(&ro->ro_dst)->sat_addr.s_net) &&
237 (satosat(&aa->aa_addr)->sat_addr.s_node == satosat(&ro->ro_dst)->sat_addr.s_node))
239 return (if_simloop(ifp, m, gate.sat_family, 0));
242 return ((*ifp->if_output)(ifp,
243 m, (struct sockaddr *)&gate, NULL)); /* XXX */